ASME SA709 Grade 50 steel

ASTM SA709 “Standard Specification for Structural Steel for Bridges”  is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships. There are eight grade in the standard ASTM SA709--Grade 36, Grade 50, Grade 50S, Grade 50W, Grade HPS 50W, Grade HPS 70W and Grade HPS 100W etc. Katalor always keeps thousands of steels structures for bridge usage including A709 materials.

ASME SA709 Grade 50 Chemical Composition

Grade	Chemical composition %
A709 Grade 50	C	Si	Mn	P	S	Cu
	≤0.23	≤0.15-0.40	≤1.35	≤0.04	≤0.05	-

ASME SA709 Grade 50 Mechanical Property

Grade	Mechanical Property
SA709 Grade 50	Tensile Strength(MPa)	Yield Strength(MPa)	Elongation in 2 in. %
	450	≧345	≧21

SA709 Grade 50 is a kind of carbon and high-strength low-alloy steel structural shapes, plates, and bars, quenched and tempered alloy steel, and stainless steel for structural plates intended for use in bridges. There are eight grades are available in four yield strength levels, and grade A709 Gr. 50 is at 345MPa level.

Elongation and reduction of area not required to be determined for floor plates SA709 Grade 50. If A709 Gr.50 plates are wider than 24 in. [600 mm], the reduction of area requirement, where applicable, is reduced by five percentage points. If  A709 Gr. 50 plates are wider than 24 in. [600 mm], the elongation requirement is reduced by two percentage points. The adjusted elongation requirement of material SA709 Grade 50 is shown in the Tension Tests section of Specification A6/A6M.